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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2ec9b8697ddc2e5c03955776edd4fa0fe4e8c64e4af75e08fef8e4c0ae2a743' 
  AND token = 'ZL9ZfjcR55ANqQj8ckY0Y9kQZbCdRaXA6YtaS0nOVIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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