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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '571913627202bb34fd9c55f3632e78c3d1a0892a036b44424d040c87cbba16d8' 
  AND token = '2ERZtFteVFZZnw0rzFPUaw8I38rzlOsr8V2azZIhcpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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