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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6750e32ee5cd933b1f6a71473b1a1772bbad7f76df5fd725b39302d855d5085' 
  AND token = 'Se3i2OuMbd+jvG2WgXtUJ7eLyJGyWoF7vu6qTgvSQpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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