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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f713e7b75a2860b5009e9b96badf6699e0529c2d7384ed5531089990502febff' 
  AND token = 'n3W+bIInzE77Gd+1U27pHZGu+YzvNDpu949HIjTIRso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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