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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd366aa819b277ba2ae7edf58a132f4297660d05e820c576cb74236606555c6d3' 
  AND token = 'ScIKM5DCq2idWilKg2iSH5z04mXlV/rPjXiLQ0pCIsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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