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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcff5ca445bb4347a9bd508579c21883ad74e0542bdace6a04c824c06f38bdfc' 
  AND token = 'lhSZo2jQfWsZfYni2Dz47rbH3ooUpXXid0Ji3Sm6xnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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