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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a2e6078e8221b9cc48dc0e293e0bf2b9e61e0c645bf7153ce4aa4085a28f34e' 
  AND token = 'hUEN2Rc0qjKVqlHAg3Yir7+EGdfHoH5qn9g0myXRw7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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