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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c36ba92f1c390b3295e287c19fd0dc81cc5a91aa4ebd5335a7db559d2514acfc' 
  AND token = 'Vt6/2xU1BtU5J20p88qSvNbETeUTIfI5jSg1DLT8yXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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