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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd4c0bd829efffaf53deff17922e38b1dcdb0e68776fb712f8a700590058a3ff' 
  AND token = 'qXqQYM65DGR0TZLBlW6bA5fvbQahh44UkObxGfuy6fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

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