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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e35be2993dcff4a82aa765663de96b3f7a7effdbd9a1f19fb9c7f6d8c0803c' 
  AND token = 'IaWHh2AKxsoQ+08i2Un4KueBB7zfUuULaaYE+p8ZhVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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