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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51c4836b948035a9a6ab6d5e75354eb0ef2075e097b7e1dd4c0a43fa11b42b3e' 
  AND token = '445ddutZqo91HGH7Ju5giSmXeoTIqv3QyIqJsYE4EvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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