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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd73f0aad97ff406779173154cb999a5aa4168e9df7560b101ae6d76dabefdc33' 
  AND token = 'Q7AinfZcY3+9WkwklWrA27Avh7/bVA+JUP9mI8NRgR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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