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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7f0b4a51673cee0818f8d96f83973130bae93cb596cd73d006cc3dfd5fb3c00' 
  AND token = '8Y9dy6x1gHd3naLIR8/P4rh09L4kUKTc9QcypVoyu0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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