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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '000b7d472e592d2bb1f7ab101ad466f6aa4b5784210333ae6c6580def6b0d2cf' 
  AND token = 'IQ6deYybwJ+5frzydp0dCaSCtlFJi8yU+FmkJuGFwIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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