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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2ef4e11795017a073de6af04358991fb4b02d612419149e86684f65e4acd664' 
  AND token = 'OMLBhYv1PzzPorkpFH4gH0MqI5xumX44Xdp+4reBUDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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