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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0df11ca3b5304df30818407d893483785eb0dec1a3c35cca15507f1f5657cca' 
  AND token = '8bE5H+iPvhmB6KHLs8HGu1lW794bWYO4R1GkSg4wnEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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