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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f5c89a9fe4cb3fa4031ddd78f9bc744811b8a92e0c56730fdc363bb7e20ec0f' 
  AND token = 'jK/5yul7iTX2ts34BalrfThh0l/EYFiJIQUu1J9qrXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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