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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51f7952dc8451939039398f17814fe2ff8e14684dbaef0648bf561782a7780f3' 
  AND token = 'LqlTULK2glrWQtTlrPRoQpwQCXZCyPqNDsliH6Pi2BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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