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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74fccaa2c297d5910324571fb1e17a41c843ea6088843feb154f875dc4ce001d' 
  AND token = 'IPG4Wd6zA2OWodh0r7YeWWnHHUxLP7eEoBoPZm5p5zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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