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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e216042d6752f64231e170f86ea104215518093cb03cb18653a1f8a86894d88b' 
  AND token = '5KNf9YFonvRuLOZ2NmIKRsOdGykvKiiiaBEISKWe7cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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