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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38d6ba9225c6c6a137193ef2b78e87b5929e8df5749744840a4aba0ab7095e79' 
  AND token = 'jUXOzS+6EbTiOMpiz4IlIWH4KCmUCK3QftlYJymNmvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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