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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '604d4620a951c0ec6b06c2cf97668ef20d16ae604f07c920f181efaffb55482d' 
  AND token = 'odC5orRuBmJlYZmyF/+nY9i55/ELfGA4imLWT3adcp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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