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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0019e07ab89a879d12dc398a7eb2c733ee31c27cc3d322a9df4a7e11a5ccb4f' 
  AND token = 'uacO0eCHZL5/kcvULbIz2aCPq5wfMnErWAe1lkOVtig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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