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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd0249c1fb697949a643adb458e3c7627f87b5400e0a26fceffe0e3e6b84cb9e' 
  AND token = '7opr5CF+I6oXDxiw7/5hv5NWwu8fUyjKTmumO6Z12Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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