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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6542ff2e7573c452d5b803d6f4b8a94bc1c52c8e62f980e715e7bb2c48cf66a5' 
  AND token = 'fNK6XRr07A+otsxbUSCo3ABth8SBhhvgHaIORwSeDA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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