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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55d026933f5f99c03e953732d45792123abaab66dd182c1db1401c9a37c50d05' 
  AND token = 'ipAN2ESu77GFn/Sreoz0v6g/VGBg+dLTb9vopVdunqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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