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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71adaaba11af4f5d7596b32008758a7c7a365fc81243893e6f7a84532084726f' 
  AND token = 'PrpGfrE0DdU4Lgy3SBlNE7d0Pdw4+rMLYHdcBlXo+O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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