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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '762870c74a5f0aa2a80e4969df111267df51309751816bf6ca297370d405492b' 
  AND token = 'uNNbLhZSxGy25Ct7tESJnZWS6QD0s3uqkul0Y8Qg8Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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