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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '158867291e741b74e2a4af87ca2c560cfa0ab3b8aeb935803351bf82b4b47039' 
  AND token = 'q9AyToOsduHEwoPUM6EeYAFMy/xk1Db9LayRH0jfBrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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