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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8f9c86fb9a09a64693277d94f49b492f66b706a22ce3e4ad77c8094d313f4da' 
  AND token = 'dKW+yR9qao6pyeP2UFBeIJKze4FwJPYeKyhcGxvTSIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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