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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9e4897aab971a5bfb202c7b07ecc3008ecd722ecc9506ea16923f818a2d7488' 
  AND token = 'v7iOh8y4Zpb69tyOQlTOpQjcCNwNblu6NX66/LKmRx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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