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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '183b4e87e5060fe147abc6cc3b7bcf3b3df9d92097686240eeb17b28e6823781' 
  AND token = '77o9xh8WsiCdvsXdOf25v4Kt1trM5jaY/X1R7DdDiCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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