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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4456de40e3f91df9205dbb2a7cc3d46ef11fc1f24a52881ce923698a95ac74ee' 
  AND token = 'lBAfliNyNreROQHqllC/m4Yh9rcVMZNCIv8CRrGLHDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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