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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7aa13d2e63b982d2d5d439a9bd730fbc0c445732f7c18ab6adc67ba2a7717c4' 
  AND token = '/gGvsfyYG2mhEoEEcs97vRN0JWZaZx//hcRvliEqCrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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