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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d93237a55f96a3852ad665f166d9fc564aae7f0fff8634450fad9a666d13814' 
  AND token = 'BmOZRgNd8Sx1kCSEl1y2b/Q3A4J5+U8YlB1BJ+XK8Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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