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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7964dfe24accdea3e8fd8d6384ead4e315862fd3a176ba993bbc1080988102ae' 
  AND token = 'M82efE1FXAhMNz2CH6os/kWNFk7vQIVxqO1g6FB8CLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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