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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c20452c2d7fc6f5ed05ef3bec86cee42ba767ea7bd386c361b7b22741dc774ca' 
  AND token = 'zp1UA8rtE5CvAQWwcXOIMUmnIYriLvBqDG1gZMRZak8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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