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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9045dd8bc2f60bea9ea455e9a55be2805fedf7753817f2a1032caf977ac3280c' 
  AND token = '2q1grD8u6R7nuVkS2F4ashiWBUQOxR4oAKACpfu1fYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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