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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9023a0f09bcf7083fe7842a481c61920e1e5c72e33b2980d7acbfba4a8e6bbae' 
  AND token = 'Gg3D9AL5WTOO/vU/vLFvKiWABBpf1JvEgLnx/KrwFKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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