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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '862845f3c53f12e9618db34bd08f165543b4b38dfe8b12b89dee83a0710f6e95' 
  AND token = 'lpgCbZzdLnfmosTgD+5S7fFtdkv3nwu5wcXmSC4hsUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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