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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b47e2f015ac590f8a69828ce5aa0c8aa602bbf87482b49331bf2b390db70c43e' 
  AND token = 'r+UVifPdySJfE6kbRBvNjW7KOKb7OFtdWOh5dUeRJN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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