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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '702214fc307d1c0161be01b9a06c2d14fbad1ee13f9efb9cb134a1aeccbbcb89' 
  AND token = '86sMZERxXEAp/uJY0dmuEkDLLPFbvBJLWtISYmjTAIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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