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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba194a3da97515a066ec8a4169031feb4f3ca61b288cd737d92cb996e0739858' 
  AND token = 'apN89sJjk65/tXTnG6Sdx1T9BIPb6rzYzdPVCtQbOtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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