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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8328bcf7c87f50956ee85b871e33e1361110a7254ba340bb1be5ecd32c8779bf' 
  AND token = 'AVG687fMjm6xinZvm53f/EP8hS10qCz/UFD/Z48rzyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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