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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e17371ecdad7178d770bed0403e0864c43505be7f623a70a5a42594e1d022076' 
  AND token = 'rpXUot06evwsInfdizZzxZcwagAGSofqHzMG/4ZQcFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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