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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '656622296eeb76defcc6c5ec88ae11206d29a3678ab6ee2622e15e1c8bad8f72' 
  AND token = 'PBHsr9GwBprUlbXnLbMQwTPpRLGSFrEg4rahxX38AA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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