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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24993e312ff751496704eecc9edd491df885c3e9985e4d77c85b86fd22a18de0' 
  AND token = 'CdLknbQ5fIcGDBfUlIeop32icGji8uv0A9Vg5cWAVKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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