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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a09f7c4c292a9a28e2b99222afb4a8bacb6b5509f27ffe05439134323f197c0' 
  AND token = 'cJxibizZke3lcG8GwPJw0d0gQRNFCcxGkciWT7leYSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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