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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f94b30813e7edce2a3aeb26c0c10a596ea3cdadc4ba45d46178bae7bb99d98f' 
  AND token = '74s1jPmztZg1mhTxIr+lbGFiGvKgEehGass3g581QN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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