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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffe9c8b7f1a2e2164582144068e0ea5ef700b8f11889c6645a60ee0f876be1d9' 
  AND token = '49gSDtm2/suKySD9JB3RqoDSI+Tjyhgu640eMn7S85I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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