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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac7c1e358f0fa9890601e11183db1e1f75ef68b5dbc516396afccfb628522bf7' 
  AND token = 'zN6elWvPpvFuSH3kd/mMP3DOvV1hIQ970mlzGQyKBmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}