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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea556217effcfe83a0e116828890b4e6bba9d315da9b181f967acc6f9650973b' 
  AND token = 'aMMxaQKhBofYcUDiIgYtfbyJGmLZ2+9SbF3X/xRSQtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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