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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47f96dff0576c8e5e844965fb965ccdd08e802a1fda024599e09784d449dc8db' 
  AND token = '71q1OElxxmzEUR81aoAV11/wepDON8i6Yo+Yv2eFHLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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