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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '928d6effa4a93226226ce52dfd4f4fad7c83b202bced19b78e6cee01b9756c5a' 
  AND token = 'Ukd8gVmiL+7huI2VUTvI22kwmB7YTBQt/F2+39lQ5BM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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