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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a60b00075390e84e635d7e83fee72ad8b27650ae18e0ffda666c6bb60423d253' 
  AND token = 'PnlMLZjVR8xQBuXLkj6KZCReVju4Vs+J3RMTZbU4JRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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