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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1476ed1af4b08c1841a4301369bbca2ab9d453d4079576e9570184e55c0d8d28' 
  AND token = 'prQHPLa5uBzEoFEYV1couQOObv4SgqcUAD/bHWfZpSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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