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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '865ba7962a83d919a4aef913a076e173a50692dac122f0d4aa98724019fdbfe8' 
  AND token = '7oGYEfIVfmg0UDja2ZigGbU6EsGaQ0ByBCTRh7AdSkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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