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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cdd022ec1445676ac704c2c161c99ca45a12a6cdfa3f3710c092e2496c68bb7' 
  AND token = 'feGc9n/14FG183Jio36kik5P+Y8H0f4Nx2liUMpcecM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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