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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58aad94d227b377d14a64361f424d32a274ccaa85794c05dc01c44788c61149f' 
  AND token = 'h8TXpnZmvM2KnbKbsLlYm1sKV6bqi5ay6e7Q3KmH6FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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