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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30264e115db72bdb25f5abc3b390d702c2d57d1699b8652b41ee76b330ceb07a' 
  AND token = 'gmE4HnKDEGzyN2jr7ZuzJtKh56pfE8/8k4sINIrnsC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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